This is the excuse that's always used, but I rarely see it play out in practice. Many people don't notice advanced features that are present, that's true. But they don't notice them so it does matter. For the people who do, they can easily discover advanced features through exploring the interface.

Apple have a tradition of being really bad at this. Many of the (slightly more) advanced features are completely hidden behind undiscoverable key combinations or very hidden features. The slide-to-reveal pattern on iOS (now mostly fixed with augmentations) is a good example. Middle clicking the titlebar in Finder to reveal the directory parents is another.